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The look up function in our project does not select the selected value whenever the field type is INT.

When we use either modal dialog or standard lookup on the field values, it displays all the available values, but when we select a value it does not pull that value into the field.

It should work. In fact most lookup fields in the demo project (e.g. cars table Trademark/Model fields) are integer fields. You can check out from the demo site.

You can show your table schema and project settings for simulating the issue.